Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Generation of Free Chlorine Using $RuO_2$/ Ti Electrode with Various Amount of Ru

Ru 코팅량에 따른 $RuO_2$/Ti 전극의 염소 발생

  • Lee, JunCheol (Graduate School of Energy and Environment, Seoul National University of Science & Technology) ;
  • Pak, DaeWon (Graduate School of Energy and Environment, Seoul National University of Science & Technology)
  • 이준철 (서울과학기술대학교 에너지환경대학원) ;
  • 박대원 (서울과학기술대학교 에너지환경대학원)
  • Received : 2011.08.27
  • Accepted : 2012.11.15
  • Published : 2012.11.30
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Abstract

We investigated the effects of electrochemical characteristics and generation of chlorine by the different amount of Ru coating which was prepared for $RuO_2$/Ti electrode coated with 1.5 mg, 2.5 mg, 5.5 mg, 8.5 mg Ru per unit area ($cm^2$). As a Result of the cycle voltammetry experiments, chlorine overvoltage of Ru-coated electrodes showed to be the nearly sustained value of approximately 1.15V (vs. Ag/AgCl). By contrary, According to the results of the AC impedance spectroscopy and potentiodynamic polarization tests, the amount of Ru per unit area ($cm^2$) included 2.5 mg, 3.5 mg as $RuO_2$/Ti offered the highest levels of durability which was electrode resistance and corrosion rate appeared to be $0.4582{\Omega}$, $0.5267{\Omega}$ and 0.082 mm/yr, 0.058 mm/yr, respectively. It was also observed that generation of chlorine coated with 3.5 mg per unit area ($cm^2$) was the highest value of 15.2 mg/L.

단위면적당($cm^2$) 루테늄의 코팅량이 1.5 mg, 2.5 mg, 3.5 mg, 5.5 mg, 8.5 mg의 $RuO_2$/Ti 전극을 제조하여 코팅량에 따른 전기화학적 특성 차이와 염소 발생에 미치는 영향을 조사하였다. 순환전압 실험 결과 루테늄이 코팅된 전극의 염소 발생 과전압은 약 1.15 V (vs. Ag/AgCl)로 거의 일정하였다. 그러나 교류 임피던스 분광법, 동전위분극실험 결과 단위면적당($cm^2$) 루테늄의 코팅량이 2.5 mg, 3.5 mg $RuO_2$/Ti 전극의 저항은 각각 $0.4582{\Omega}$, $0.5267{\Omega}$, 부식속도는 각각 0.082 mm/yr, 0.058 mm/yr로 내구성이 가장 우수하였다. 염소 발생량은 단위면적당($cm^2$) 루테늄의 코팅량 3.5 mg 전극이 15.2 mg/L로 가장 높게 측정되었다.

Keywords

Acknowledgement

Supported by : 서울과학기술대학교

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